Where can I see my current XP total?

Here's what the help page says: "....There are currently 25 levels, and you can always see how close you are to reaching the next level on your Home page." I see no total anywhere on my Home Page. A previous version of Duo gave you a total after every unit...but no more! What am I missing?

Thank you to Andre! However, I can't really make this work because (a) I am no programmer and things like "userscript" mean nothing to me ! and (b) I use Firefox, so the step-by-step instructions don't align. Does anybody out there have a step-by-step for Firefox?